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Response of the Electric Field Gradient in Ion implanted BaTiO3 to an External Electric Field

Published online by Cambridge University Press:  21 March 2011

Marc Dietrich ,
Jörn Bartels ,
Manfred Deicher ,
Kristian Freitag ,
Vyacheslav Samokhvalov  and
Sepp Unterricker
Marc Dietrich
Affiliation:
Fachbereich Physik, Universität Konstanz, D-78457 Konstanz, Germany
Jörn Bartels
Affiliation:
Institut für Strahlen- und Kernphysik, Universität Bonn, D-53115 Bonn, Germany
Manfred Deicher
Affiliation:
Fachbereich Physik, Universität Konstanz, D-78457 Konstanz, Germany
Kristian Freitag
Affiliation:
Institut für Strahlen- und Kernphysik, Universität Bonn, D-53115 Bonn, Germany
Vyacheslav Samokhvalov
Affiliation:
Institut für Angewandte Physik, TU Bergakademie Freiberg, D-09596 Freiberg, Germany
Sepp Unterricker
Affiliation:
Institut für Angewandte Physik, TU Bergakademie Freiberg, D-09596 Freiberg, Germany
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Abstract

Single crystalline, ferroelectric BaTiO3 as material with the highest piezoelectric constants among the perovskites with ordered sublattices was implanted with 111In(111Cd). The electric field gradient at the Ti position was measured with perturbed γγ-angular correlation spectroscopy (PAC) while the crystal was exposed to an external electric field. A quadratic dependence could be observed: νQ(E) = (34.8(1) + 0.16(4) E/kV/mm + 0.080(2) E2/kV2/mm2) MHz. Point charge model calculations reproduce the linear change of Vzz, but not the quadratic term. The polarizability of the host ions of BaTiO3 is known to be nonlinear with respect to an electric field. The resulting quadratic shift of the electron density is reflected in the strength of the EFG.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 655 , 2000 , CC10.11.1
Copyright
Copyright © Materials Research Society 2001

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